CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) [Abstract]
Net income	$ 75.5	$ 65.3	$ 72.6
Foreign currency translation adjustments	(11.8)	(13.0)	19.0
Defined benefit pension and other postretirement plans: [Abstract]
Prior service credit arising during period, net of tax of $2.0	0	3.2	0
Net actuarial loss arising during period, net of tax of $(17.9), $(2.6) and $(1.1)	(30.1)	(5.0)	0
Curtailment arising during period, net of tax of $(0.2)	(0.4)	0	0
Settlement effects arising during the period, net of tax of $0.3	0.5	0	0
Less: amortization of actuarial loss, net of tax of $2.2, $2.1 and $2.7	3.8	3.4	4.3
Less: amortization of prior service credit, net of tax of $(0.5), $(0.4) and $(0.4)	(0.9)	(0.6)	(0.6)
Less: amortization of transition obligation	0.1	0.1	0.1
Net gains on investment securities, net of tax of $0.2, $0.4 and $0.3	0.3	0.6	0.4
Net (losses) gains on derivatives, net of tax of $(1.1), $(0.2) and $1.2	(1.7)	(0.3)	2.0
Other comprehensive (loss) income, net of tax	(40.2)	(11.6)	25.2
Comprehensive income	$ 35.3	$ 53.7	$ 97.8